content: /*
   * Copyright (C) 2008 ZXing authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alipay.hulu.ui.scan.camera;
  
  import android.content.Context;
  import android.graphics.Point;
  import android.hardware.Camera;
  import android.util.Log;
  import android.view.SurfaceHolder;
  
  import com.alipay.hulu.ui.scan.camera.open.OpenCamera;
  import com.alipay.hulu.ui.scan.camera.open.OpenCameraInterface;
  import com.google.zxing.PlanarYUVLuminanceSource;
  import java.io.IOException;
  
  /**
   * This object wraps the Camera service object and expects to be the only one talking to it. The
   * implementation encapsulates the steps needed to take preview-sized images, which are used for
   * both preview and decoding.
   *
   * @author dswitkin@google.com (Daniel Switkin)
   */
  public final class CameraManager {
  
      private static final String TAG = CameraManager.class.getSimpleName();
  
      private final Context context;
      private final CameraConfigurationManager configManager;
      private OpenCamera openCamera;
      private AutoFocusManager autoFocusManager;
      private boolean initialized;
      private boolean previewing;
      private Camera.PreviewCallback previewCallback;
      private int displayOrientation = 0;
  
      // PreviewCallback references are also removed from original ZXING authors work,
      // since we're using our own interface.
      // FramingRects references are also removed from original ZXING authors work,
      // since We're using all view size while detecting QR-Codes.
      private int requestedCameraId = OpenCameraInterface.NO_REQUESTED_CAMERA;
      private long autofocusIntervalInMs = AutoFocusManager.DEFAULT_AUTO_FOCUS_INTERVAL_MS;
  
      public CameraManager(Context context) {
          this.context = context;
          this.configManager = new CameraConfigurationManager(context);
      }
  
      public void setPreviewCallback(Camera.PreviewCallback previewCallback) {
          this.previewCallback = previewCallback;
  
          if (isOpen()) {
              openCamera.getCamera().setPreviewCallback(previewCallback);
          }
      }
  
      public void setDisplayOrientation(int degrees) {
          this.displayOrientation = degrees;
  
          if (isOpen()) {
              openCamera.getCamera().setDisplayOrientation(degrees);
          }
      }
  
      public void setAutofocusInterval(long autofocusIntervalInMs) {
          this.autofocusIntervalInMs = autofocusIntervalInMs;
          if (autoFocusManager != null) {
              autoFocusManager.setAutofocusInterval(autofocusIntervalInMs);
          }
      }
  
      public void forceAutoFocus() {
          if (autoFocusManager != null) {
              autoFocusManager.start();
          }
      }
  
      public Point getPreviewSize() {
          return configManager.getCameraResolution();
      }
  
      /**
       * Opens the camera driver and initializes the hardware parameters.
       *
       * @param holder The surface object which the camera will draw preview frames into.
       * @param height @throws IOException Indicates the camera driver failed to open.
       */
      public synchronized void openDriver(SurfaceHolder holder, int width, int height)
              throws IOException {
          OpenCamera theCamera = openCamera;
          if (!isOpen()) {
              theCamera = OpenCameraInterface.open(requestedCameraId);
              if (theCamera == null || theCamera.getCamera() == null) {
                  throw new IOException("Camera.open() failed to return object from driver");
              }
              openCamera = theCamera;
          }
          theCamera.getCamera().setPreviewDisplay(holder);
          theCamera.getCamera().setPreviewCallback(previewCallback);
          theCamera.getCamera().setDisplayOrientation(displayOrientation);
  
          if (!initialized) {
              initialized = true;
              configManager.initFromCameraParameters(theCamera, width, height);
          }
  
          Camera cameraObject = theCamera.getCamera();
          Camera.Parameters parameters = cameraObject.getParameters();
          String parametersFlattened =
                  parameters == null ? null : parameters.flatten(); // Save these, temporarily
          try {
              configManager.setDesiredCameraParameters(theCamera, false);
          } catch (RuntimeException re) {
              // Driver failed
              Log.w(TAG, "Camera rejected parameters. Setting only minimal safe-mode parameters");
              Log.i(TAG, "Resetting to saved camera params: " + parametersFlattened);
              // Reset:
              if (parametersFlattened != null) {
                  parameters = cameraObject.getParameters();
                  parameters.unflatten(parametersFlattened);
                  try {
                      cameraObject.setParameters(parameters);
                      configManager.setDesiredCameraParameters(theCamera, true);
                  } catch (RuntimeException re2) {
                      // Well, darn. Give up
                      Log.w(TAG, "Camera rejected even safe-mode parameters! No configuration");
                  }
              }
          }
          cameraObject.setPreviewDisplay(holder);
      }
  
      /**
       * Allows third party apps to specify the camera ID, rather than determine
       * it automatically based on available cameras and their orientation.
       *
       * @param cameraId camera ID of the camera to use. A negative value means "no preference".
       */
      public synchronized void setPreviewCameraId(int cameraId) {
          requestedCameraId = cameraId;
      }
  
      public int getPreviewCameraId() {
          return requestedCameraId;
      }
  
      /**
       * @param enabled if {@code true}, light should be turned on if currently off. And vice versa.
       */
      public synchronized void setTorchEnabled(boolean enabled) {
          OpenCamera theCamera = openCamera;
          if (theCamera != null && enabled != configManager.getTorchState(theCamera.getCamera())) {
              boolean wasAutoFocusManager = autoFocusManager != null;
              if (wasAutoFocusManager) {
                  autoFocusManager.stop();
                  autoFocusManager = null;
              }
              configManager.setTorchEnabled(theCamera.getCamera(), enabled);
              if (wasAutoFocusManager) {
                  autoFocusManager = new AutoFocusManager(theCamera.getCamera());
                  autoFocusManager.start();
              }
          }
      }
  
      public synchronized boolean isOpen() {
          return openCamera != null && openCamera.getCamera() != null;
      }
  
      /**
       * Closes the camera driver if still in use.
       */
      public synchronized void closeDriver() {
          if (isOpen()) {
              openCamera.getCamera().release();
              openCamera = null;
              // Make sure to clear these each time we close the camera, so that any scanning rect
              // requested by intent is forgotten.
              // framingRect = null;
              // framingRectInPreview = null;
          }
      }
  
      /**
       * Asks the camera hardware to begin drawing preview frames to the screen.
       */
      public synchronized void startPreview() {
          OpenCamera theCamera = openCamera;
          if (theCamera != null && !previewing) {
              theCamera.getCamera().startPreview();
              previewing = true;
              autoFocusManager = new AutoFocusManager(theCamera.getCamera());
              autoFocusManager.setAutofocusInterval(autofocusIntervalInMs);
          }
      }
  
      /**
       * Tells the camera to stop drawing preview frames.
       */
      public synchronized void stopPreview() {
          if (autoFocusManager != null) {
              autoFocusManager.stop();
              autoFocusManager = null;
          }
          if (openCamera != null && previewing) {
              openCamera.getCamera().stopPreview();
              previewing = false;
          }
      }
  
      public OpenCamera getOpenCamera() {
          return openCamera;
      }
  
      /**
       * A factory method to build the appropriate LuminanceSource object based on the format
       * of the preview buffers, as described by Camera.Parameters.
       *
       * @param data A preview frame.
       * @param width The width of the image.
       * @param height The height of the image.
       * @return A PlanarYUVLuminanceSource instance.
       */
      public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
          return new PlanarYUVLuminanceSource(data, width, height, 0, 0, width, height, false);
      }
  }
  